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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a938364209779b36f930e14ae1393f72e9810da92ab65656df8b396675f836a' 
  AND token = 'o68UjynknumCcRoKcmupXD+KRK6u4TwyCuxGRqK/t/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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