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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7485521a3747158b44cd4ba5a9e76c83cbc19db1008ca548b0dcef80e213313f' 
  AND token = 'efidjpHm/sWd93TgBeqvrkINz3tsQoZI/jOseIqk3q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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