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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6b6e6a5e0e96449f3db04a02f41d75414690ae0c246f532b5e9de3c928e5cd' 
  AND token = 'HAmh/R4QgvYsge5kY7Prcmlgc5tOAgqZTV640j8EoLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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