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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95c16915bd767b158ec4531d79c6da80109e0d9caba09cee17f202a343a1ecc' 
  AND token = 'SfNGX6MtqR5NK1OMqm8yj/N5j3akdznej2iQ55PpvbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}