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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbf43c23f334ff213d434dacd0098721a0cb423c68bc31e0cae103172309826' 
  AND token = 'KFd/REDIoXraMowkbRkRjEm8U+pJoi2IWhNpB7/3rUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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