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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fcb0584a98ecffc92c968a70eca07e6d2818997251376e737bacb89ea05159' 
  AND token = 'eT0Vje1eNQdnk0s3uCWvvWaBUr2ZiW1CXKWQ1ckfnpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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