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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3564cf2f286eccfaed1db46cc7ffef242c2e7d2cdbbd7b740e17f10eb774b7f' 
  AND token = 'CW3EiVXJ3B1tj8sG8OHU6fL8fcKCx48B70ASholl3OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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