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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8658dae0a7971adb40e56354c19c5ad43185c923916bbab444e3e1abdca7c78f' 
  AND token = 'K0venXYTV5DO04PX2HIaSOjeVcofqmIyFK0dn7SkqkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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