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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82dee8a1fae0686833e6a8873c2d6a5fcce548bd30233090e95de6245a32821' 
  AND token = 'Ktv/7M5DI3eFg0jyXOmvALJv/gvzjheU1i8M7I/Luak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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