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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35857a6e14d830dbcd18135e456f7d0f9556d78c09ab7c6e2ba861905a862efe' 
  AND token = 'kWZs3qVUoozJ3nr5P28tcqRB3RtC/iIa5jsD+q642hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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