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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fded86ca42877abb524d4dc8ffe64e475ed8f95478b68a5ed400347a66e7572e' 
  AND token = 'wuzSB8N9rOzsfkjMpgM0dJIBpSMr3yWPf/3WjQ9ixFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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