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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40a215d71aed5474b3bc1e66f012d1a6a8fe9c117192e7090cecd9a16687e2d' 
  AND token = 'Ib+UDg8HsCuCsJrLH40Jy7f3mpzi/B/hvdGDOFzwITw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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