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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2404ef4c10db1236cd6226faba58d49d8eb9be6cce743bbe7e2aad9788226a35' 
  AND token = 'HmIKQoZr7TToidatLbrN2kksVvKMCJ3Cc1ALNR0h7XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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