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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837eddcee0501d51eb3710d097e45c6fc9b450923df0cd41650fa43589ec3e8a' 
  AND token = '8hwQ/O+eqJ2Oj2eG5WgDzJiV1NozqEa2Jaui7Ex1KEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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