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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2627026bad8fc6adc70570e8683bef9e1f49b3f3780550d4f78010b3359f0edf' 
  AND token = 'Tv1f4wcPJK41Cr8d0PQZhAnpX0TuN888MFKYIVl5jqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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