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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203d75875bae67bff657251efd62208e9e225b9c2a970c537834876f9b2e8576' 
  AND token = '30eVzIKgFeir0t9zUHvtunNyzEPp0wp9L0e4bCcxS9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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