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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16209927d69e6eee4eb86449432bb634a7c9e49e33a450d66c4fe3df2dfbbeb' 
  AND token = 'Q/Lqu7ci+N4NNQc+FpPUT6HsdkiUdD39vXblqhL0qf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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