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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c08ce452e81f697150b6038fbf5fa2e40e7617c6ffa0ef8cead0a45c9583db' 
  AND token = '58Y/nyzyFyl5Cgd8Pq/2iXaB06+elYHOZZalRAVB3Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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