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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441f9024f29a9bce70ea58b58b2aa6bae90e223d8bf8174a6036f7cc6cce452d' 
  AND token = 'Kqazz1ehb247iDDUdWkjA7Sen0KiU3g02OZPdykvSSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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