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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11689233d51491f0489a9b2a02a5d92b951f8c5c3a962a22a00e67296a0a045' 
  AND token = '5gM0vq6uY9hipcb3flbgLcGwqi007HHwaqZDk6brhN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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