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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77cca29497a8eea6a56433ffac8a7d3e458d502bf4b9d62aad6e4e0279b2c83' 
  AND token = '36NKmQSTV7TYPMU3DE+/5Ziqryvho1aImY4GoDj13vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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