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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619a81ab2625ddb67cb28b1665762d59ae9e1a6b944c7215260c03f90afad0f2' 
  AND token = '7g6zJC3jvxgHTQWOARmqp5poit+vLNH5Rbi7S7cT8o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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