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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba457ba30de97fe75a9029cc305d7f0d7d6ad70abf388e006efc60893a5325ed' 
  AND token = 'LL1v6UvHgQJaemF/d9I88bTR4WCpVNNpoKXXjn9Mle0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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