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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb56cc352a340a6f1c10063eaf7009d0e6f35b755c644f643e55d3963af3ae0' 
  AND token = 'uaFrKGnLv1vbbm2Av8v257vtKvAs5BMxY+OUJF/WTfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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