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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ee780402682e273549a82e7d2913e7244fc9c65fe84ce649c3a5e64f34359d' 
  AND token = 'PhO5K8bATlUye9Tjlk+fbd8R0/fbUXN+1jI6A9QViU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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