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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c07dadc6ca7a89d7729b98e52da5578c837d8b605d2973742109414b720af9' 
  AND token = 'hM85qNUCVfj1yuO9H1k9Ta8dhtWDAbOH8ksq8mprzmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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