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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96abdde7c104625076961503851052c7b1a5a76008509870aebb588c1fbf12e8' 
  AND token = 'nVdVad+9HGgLVyAPxtNJOK99OSIshvuC1C1/y5hCxpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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