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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41dc24b132e20534e8728e226973a465f3cc2a79db2557156e96d042a623f959' 
  AND token = 'Nb7T/X5hzQjbFwYispV6XZOIF0bwDMhIboYa8l7e3aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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