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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5819cde8c00a38cfa2e430b711c0702b15518c798992dc26b5b676dd27fcd3d3' 
  AND token = 'UZ8RpkwEXJzRL6Siaz7vhO95GyS8oNNG1A0Z7owAu94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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