SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62089fef51d57e3b18bc9f52f88dd7e9320033b82efce6ea9dab5cf4e2976df8' 
  AND token = 'HwIGrhIZwRl+ZPXIRNWXaJvquotsYFUw1WqIvsfi65c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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