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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95137fc8d1f732f9535d3524b97b257a9f5cb5afdd306252ee06612c4979955' 
  AND token = 'JMfLmvuqH5V6sJiLowx0nmoqRXlPlwRH5+oY7sLqHnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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