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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018d3fba8f80b450c8ac0e0f0a9fe87443cab9908b97d3f2d952d371ce65b7c0' 
  AND token = 'yv9WYYZ8EqqU6enzu/vXDrb6hWkVesR3zuH4Mi/zAuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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