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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeae50ce88cf565559f11203f35494964f4bcc12e27bc106c6d14f947c696b1' 
  AND token = 'uAtR3Ho8R/1o+RdjzQsA/705HIhzcoiXHeunS0AZI6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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