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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c91490195e813b720622354b3dcc49056e0db3c796bafb3412d54ea9d7c71b1' 
  AND token = 'zVWnVvA422IMf440/0auNetxNN6cyz87hcTdvD8UCIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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