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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70060b14e253f12ee715718602d688df071650a4bf42dae2aa8dcd6b2973ee2c' 
  AND token = 'JYhD2abFbx1O39Co8bSnxw/ypJDbCr9oxZxmxKX7fvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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