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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3630569e63f3b5f461fef2349c857e1c12689e37bd76073f9e1d608dd0aa601' 
  AND token = 'H+cBT25tyZ/BzQ0g/JLQHhy/eW9bMyeXwgb+VZq1tac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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