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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e68af9574224710dbb2ccc4c9f683fce056bc51d3856601889f0b0a630bda4f' 
  AND token = 'd5T8clv7CPlOdW4LS4k5I6oWjrLUTHDLVjModRxBiq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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