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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d145bd0c1087dac518440d3300d9faed808fca1d8b7804b8aeaf72218295686' 
  AND token = 'kRlvaqNtPsKRmkg6SGX4ZKDsyzUNZ8LkbGarVvlf1kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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