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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81320afd5e6bcb4e846edf6e4ded0b583154480450b4670ca73381fde941711' 
  AND token = 'AqPzhAjDm8qdNx4GHlC9YvIF7KrzA0t5raoZDHft+Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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