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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1cc76b19b342bf6f6cc2d292923a16bdf68a2bddfc8e8d42337170bd009a29' 
  AND token = 'h8QwZmvnkr81iMmGo56rcQ5eJBIc2fadbNkl3bOmhq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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