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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5d4204a5246bff4617337d0ff90268357a6098119c83d9b4328fe882aae823' 
  AND token = '+HM2z46tIdKi1yDIjrGGRrx6b7f4k55k91orXUHb+L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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