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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b515a62604baaecfd2bfd8cf8d64d2957d80b0eda9b3aea69f0972b63b1cf2b' 
  AND token = 'Xt24eK9ZPNrT3+bQXwu1G9q7cTlldQP7dZSSUZgTDm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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