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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973330e9b65809cb6e918f9a9eb19d870bf4a15fab9ecd7604b15b76bef45b1f' 
  AND token = 'P5/PrLgDiqfKHcAcvq/nvRNw7FUpyHkhx5hD2EEileM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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