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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5032032a0a23d50f5346575755c0d705ab3a58e1923c5ff0643bb3cfad0ab1fe' 
  AND token = 'gLV0m1j96JzWfuY04v3OfNdyxn/eYfDqD/0jVB4GUa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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