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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7e1d40bdc369d36f3049e9322d3c16958288dc67b813bfaec16ff0dbe778a1' 
  AND token = 'cgcxChTkURU2LUnilIzzkGegu+cyEnLd0dp2GhVnHeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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