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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9730e942c0a95fb44d6458fa1f0dc117649589edae2e7b517e12738079253c' 
  AND token = 'UL4ltZZw8t3cEraTeMxNHMbZ8fR/hWH+mowFr08GnDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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