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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54135aba6cc342993801f1739898690c65c5859b98c0b460f43ada527cf2d1b' 
  AND token = 'r1VXUfQm9OlNTbBUeTzQIw8Dyk9DrSKwNG8u6BgzZmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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