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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a85dccb4df716b21c954ec411a7ffc108cad729536081a33f2cb6b10c195895' 
  AND token = 'EeLYBp2898VhZCsRmghfTgtJT4zO72AjuueTT5ph4t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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