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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae3642fc33cf44c0837697f72fbacb4ec9b36145cb06bac39a204b825a6d06f' 
  AND token = 't5/h5QHebswdKORn7Uet3/1wRFgJ0THViORPxCW3Ki4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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