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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046af18e799df13db75977c8e5c9e60e3112d30534e6b9e6bfdf0afccfb81d92' 
  AND token = 'IDLTfT088rsIii0rCicDy6wF+rtU6oJiBwgLjOUYDYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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