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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41abc3ccf681a8cbdf3543ea8c702d9c88c5ba71f3c3dd9e55ec100b5b9f23c5' 
  AND token = 'j8DBtzhkHxJuInMLJRr9ib7XxYRA1xHU3qRx1oFDoQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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