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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40cf12e3d3c4e6c3e99f2689495be0fb4e71e614959c91a1ecde0d489cc3870' 
  AND token = 'uuKgv++PC1B3+bU09VWPilpltFrouS9rZE49T6YmSQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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