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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c79301bc6daae80378eb6221c67a245ef5a9d8981d2a19ad914c2769806bc0' 
  AND token = 'POqU/CHT/Wn92l1Dhx6VsIhGncakhby3GDtkNU+q7QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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