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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9d85c0606f26405c947cd8dc742ffafcf0c94276037f26f086b01bdfd6ff9e' 
  AND token = 'WDTwVrPzjR03VROjQ+KKt2EL9lrjtKmSnrR6oaBMztc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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