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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2756c69bc3b72f4079cc47216e2fad3aadbfee9a9a286c65efb327e2bfea117' 
  AND token = '4cUClc7jWVcnDaUPMJJnhIX5zWEjJoqvH/+k1B8F7j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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