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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfebbb19766ee266c38f50d323f710b39bdb22c5570744a81e231745f739b7f' 
  AND token = '4jZtUaxyw8Y8PALcnCBV8ezPFgz1bHU2PrxV+D3+y2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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