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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7437c01592378c8d2fa3890a693b8e0788bc1b1bbbfff0ba585d1a5eee9bd534' 
  AND token = '1j20j3NlSJG51kO2nHh3ZtoF8H42bFjwJiGU/Z2EjOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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