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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b610a9a3c38294033d2919571c4264a1706d0965b8b26920a0d6057031986002' 
  AND token = 'bNF3B8aBX9yANIiQgRMNW4N6TUZ5ax7MA5mcFG4+b8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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