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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f819f57748ef0c0c3f202feb6434ae8a44f84c7c32fda541d6457478e63051' 
  AND token = '0p2RxwWu+e2QYlgjnRs5+lcJR/u3PVIUbu646DgZ0Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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