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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d8cd82ca6d5c53334779f2ff639449316e9cf5803b6c09a1d1b461cb9367ad' 
  AND token = '9bI/DNx8o1k0LAa6N0ovv1tyVInxr8o+6XIJ2uDOEEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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