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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06eb88e275abe5e9894383cea167ed916a0b98eb07b04b4eddb8ed903583a376' 
  AND token = '9Cf6g/nuCWzVDbK7WEaehNTRuuUtvTDx3W716zod5b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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